HMH Chemistry

When wood is burned, the mass of the remaining ash is less than the mass of the original wood. Which statement best explains this result?

•    The ash has less volume than the paper.

• Some of the matter is destroyed during the reaction.

• The mass of the ash cannot be accurately determined.

• Some of the products of the reaction were given off as a gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which substance is a product in this reaction?
2 HCl + CaCO₃ = CaCl₂ + H₂O + CO₂

• 2 HCl

• CaCO₃ 

• CaCl₂

• C

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which number completes the balanced chemical equation? 
4 Fe + ____ O₂ = 2 Fe₂O₃

• 2

• 1

• 3

• 4

Tags

NGSS.MS-PS1-5

What does a letter represent in a chemical equation/formula? (ex. H₂O)

• Element

• Number of Atoms

• Number of compounds

• A chemical formula

Which item on this element square is the chemical symbol?

• Copper

• 29

• Cu

• 63.546

An element is

• Made up of different types of atoms

• Made up of the same type of atoms

• none of the above

• all of the above

Tags

NGSS.MS-PS1-1

This shows a table salt molecule. What is it?

• compound

• element

• mixture

Tags

NGSS.MS-PS1-1

How many valence electrons does Silicon Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Tags

NGSS.MS-PS1-1

How many valence electrons does Potassium Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Made up of only 1 type of atom

• Compound

• Molecule

• Element

• Mixture

Tags

NGSS.MS-PS1-1